government officials dzhokhar tsarnaev is talking to investigators, communicating with them. and one of the things that he is saying, and investigators making sure it's all accurate, they acted alone, the two brothers. there was no foreign terrorist group they were self radicalized from the internet and, also, that their motivation was jihadist with the islamist extremist that that entailed. i also learned today from the same official, that part of that, part of the jihadist sentiment that they were acting because the way to defend islam from being you should attack in their view, one of the ways that came to fruition in their view was the wars in iraq and afghanistan. so, in other words, dzhokhar is saying that is one of the reasons they carried out the attack. and it is likely, he said, that anwar al alacki, the cleric who was killed by u.s. drones a couple of years ago, that his sermons were among those used to radicalize those among others. anderson? >> and what have investigators been able to learn as to whether or not he and his brother were in contact with any foreign